自己分解性プラスチックを作るため,PLAに組み込まれた工学的な酵素
M Guicherd1,2, M Ben Khaled1, M Guéroult1,2
1Toulouse Biotechnology Institute, Université de Toulouse, CNRS, INRAE, INSA, Toulouse, France.
Nature
|July 17, 2024
まとめ
新しいポリアクチド (PLA) プラスチックには 生物分解を速めるための最適化酵素が含まれています このPLAフィルムは 24週間以内に家庭用堆肥の基準を満たし プラスチック廃棄物の持続可能な解決策を提供します
科学分野:
- 材料科学
- バイオテクノロジー
- 環境科学
背景:
- 世界的なプラスチック生産,特に使い捨て品は 深刻な環境汚染を引き起こしています.
- 生物分解性や堆肥性のあるプラスチックが 廃棄物管理の解決策として求められています
- ポリアクチド (PLA) は,一般的なバイオベースのプラスチックで,土壌や家庭用堆肥の環境でゆっくりと生物分解します.
研究 の 目的:
- ポリアクチド (PLA) 基のプラスチックを開発し,室温で生物分解し,堆肥化が促進される.
- 活性が著しく改善された高熱安定性PLAヒドローラスを設計する.
- この酵素をPLAに統合するには,実用的なアプリケーションのためのスケーラブルな工業プロセスを使用します.
主な方法:
- 構造に基づいた合理的な工学でPLAのヒドローラゼを 80倍に増やす.
- 溶融エクストルーションを用いたポリキャプロラクトン (PCL) マスターバッチを通じてPLAに酵素を分散する.
- 160°Cでの溶解によるPLAフィルム (0.02%の酵素) の生成
主要な成果:
- 酵素化されたPLA膜は20~24週間で完全に分解した.
- この素材は 家庭用堆肥の基準を満たしています
- 酵素フィルムは工業用包装に適した機械的性質と保管中の安定性を示した.
結論:
- 急速に生物分解可能なPLAを製造するための工業的に拡張可能なプロセスが確立されています.
- この酵素化されたPLAはプラスチック廃棄物の管理に有効な解決策であり,堆肥化やバイオメタンの生産におけるアプリケーションをサポートします.
- この材料が産業用包装の要件と適合し,貯蔵の安定性は,その実用的な可能性を強調しています.
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